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Are clock genes involved in the mechanical stress responsiveness of osteocytes?

Research Project

Project/Area Number 19K10416
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeMulti-year Fund
Section一般
Review Section Basic Section 57070:Developmental dentistry-related
Research InstitutionAichi Gakuin University

Principal Investigator

Kondo Hisataka  愛知学院大学, 短期大学部, 准教授 (40469002)

Co-Investigator(Kenkyū-buntansha) 浜村 和紀  愛知学院大学, 歯学部, 教授 (00422767)
戸苅 彰史  愛知学院大学, 歯学部, 教授 (80126325)
田中 健二郎  愛知学院大学, 歯学部, 歯学部研究員 (80780296)
Project Period (FY) 2019-04-01 – 2024-03-31
Project Status Completed (Fiscal Year 2023)
Budget Amount *help
¥4,290,000 (Direct Cost: ¥3,300,000、Indirect Cost: ¥990,000)
Fiscal Year 2022: ¥780,000 (Direct Cost: ¥600,000、Indirect Cost: ¥180,000)
Fiscal Year 2021: ¥910,000 (Direct Cost: ¥700,000、Indirect Cost: ¥210,000)
Fiscal Year 2020: ¥1,040,000 (Direct Cost: ¥800,000、Indirect Cost: ¥240,000)
Fiscal Year 2019: ¥1,560,000 (Direct Cost: ¥1,200,000、Indirect Cost: ¥360,000)
Keywords概日リズム / 骨代謝 / 骨細胞 / 時計遺伝子 / メカニカルストレス
Outline of Research at the Start

地球上の殆どの生物には24時間周期の概日リズムが存在している。この概日リズムをコントロールするものとして細胞の中で時を刻む時計遺伝子が知られている。歯の移動のしやすさは昼と夜とで異なるという報告があるが、これに時計遺伝子は関与しているのか?本研究では骨細胞に焦点をあて、骨細胞のメカニカルストレス応答性に時計遺伝子は関与するか否か明らかにすることを目的とする。

Outline of Final Research Achievements

Most organisms on Earth have a circadian rhythm, with the suprachiasmatic nucleus at its core, sensing the beginning of the day through light and prompting the adrenal cortex to secrete glucocorticoids. These glucocorticoids travel through the bloodstream and reach osteoblasts, osteoclasts, and osteocytes, regulating the circadian rhythms of their clock genes. This study revealed that mechanical stress applied to teeth activates sensory nerves around the tooth root, which then convert this signal into a sympathetic nervous signal through the central nervous system. This leads to increased expression of RANKL around the tooth root, activation of osteoclasts, and promotion of tooth movement. Furthermore, in mice, it was confirmed that tooth movement is greater during the light period (7:00-19:00) than during the dark period (19:00-7:00), indicating that tooth movement also exhibits a circadian rhythm.

Academic Significance and Societal Importance of the Research Achievements

本研究から矯正力を加えた歯の周辺にのみ、破骨細胞が形成される機序として、歯の移動により活性化される感覚神経と交感神経との関係が初めて明らかになった。また、矯正歯科治療において歯の移動の起こりやすい時間帯があることが明らかとなった。これらの知見は矯正歯科治療に神経系をターゲットとした治療薬の開発や歯科矯正の時間治療といった新しい概念をもたらす可能性がある。

Report

(6 results)
  • 2023 Annual Research Report   Final Research Report ( PDF )
  • 2022 Research-status Report
  • 2021 Research-status Report
  • 2020 Research-status Report
  • 2019 Research-status Report
  • Research Products

    (5 results)

All 2023 2021 2020

All Journal Article (2 results) (of which Int'l Joint Research: 1 results,  Peer Reviewed: 2 results,  Open Access: 1 results) Presentation (3 results) (of which Int'l Joint Research: 1 results)

  • [Journal Article] Orthodontic tooth movement-activated sensory neurons contribute to enhancing osteoclast activity and tooth movement through sympathetic nervous signalling2021

    • Author(s)
      Hisataka Kondo, Mayo Kondo, Kaori Hayashi, Sae Kusafuka, Kazunori Hamamura, Kenjiro Tanaka, Daisuke Kodama, Takao Hirai, Takuma Sato, Yoshiko Ariji, Ken Miyazawa, Eiichiro Ariji, Shigemi Goto, Akifumi Togari
    • Journal Title

      European Journal of Orthodontics

      Volume: - Issue: 4 Pages: 1-8

    • DOI

      10.1093/ejo/cjab072

    • Related Report
      2021 Research-status Report
    • Peer Reviewed / Int'l Joint Research
  • [Journal Article] Effects of Glucocorticoids on Diurnal Variations in Experimental Tooth Movement2020

    • Author(s)
      Kusafuka S, Kondo H, Hayashi K, Hamamura K, Sato T, Miyazawa K, Goto S, Togari A.
    • Journal Title

      Journal of Hard Tissue Biology

      Volume: 29 Issue: 4 Pages: 231-238

    • DOI

      10.2485/jhtb.29.231

    • NAID

      130007930685

    • ISSN
      1341-7649, 1880-828X
    • Related Report
      2020 Research-status Report
    • Peer Reviewed / Open Access
  • [Presentation] マウス卵巣摘出モデルにおけるNfil3によるRANKLの制御2023

    • Author(s)
      近藤久貴,田中健二郎,兒玉大介,相羽凜花,時国玲羅,野村春香,井上誠,平居貴生
    • Organizer
      日本睡眠学会第45回定期学術集会、第30回日本時間生物学会学術大会・合同大会
    • Related Report
      2023 Annual Research Report
  • [Presentation] Diurnal variation of experimental tooth movement.2020

    • Author(s)
      Kusafuka S, Kondo H, Sato T, Togari A, Miyazawa K, Goto S.
    • Organizer
      The 9th International Orthodontic Congress
    • Related Report
      2020 Research-status Report
    • Int'l Joint Research
  • [Presentation] マウス骨細胞様細胞株におけるグルココルチコイドによる時計遺伝子と破骨細胞分化誘導因子の発現制御,2020

    • Author(s)
      草深彩恵,近藤久貴,佐藤琢麻,戸苅彰史,宮澤 健,後藤滋巳
    • Organizer
      第44回日本口蓋裂学会
    • Related Report
      2020 Research-status Report

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Published: 2019-04-18   Modified: 2025-01-30  

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